US 11,965,069 B2
Heat-shrinkable polyester film and method for manufacturing the same
Li-Ling Chang, Taipei (TW); Yow-An Leu, Taipei (TW); Ting-Yu Lin, Taipei (TW); Ching-Chun Tsai, Taipei (TW); and Wen-Yi Chang, Taipei (TW)
Assigned to FAR EASTERN NEW CENTURY CORPORATION, Taipei (TW)
Filed by FAR EASTERN NEW CENTURY CORPORATION, Taipei (TW)
Filed on Feb. 5, 2021, as Appl. No. 17/169,089.
Claims priority of application No. 109104900 (TW), filed on Feb. 15, 2020.
Prior Publication US 2021/0253810 A1, Aug. 19, 2021
Int. Cl. C08J 5/18 (2006.01); C08J 11/12 (2006.01)
CPC C08J 5/18 (2013.01) [C08J 11/12 (2013.01); C08J 2367/02 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A heat-shrinkable polyester film made of a polyester-forming resin composition which includes a recycled material, terephthalic acid, ethylene glycol, and an alcohol modifier, and based on a total molar amount of said ethylene glycol and said alcohol modifier, said ethylene glycol is present in an amount ranging from 70 mol % to 85 mol %, and said alcohol modifier is present in an amount ranging from 15 mol % to 30 mol %, said heat-shrinkable polyester film having an exothermic crystallization peak and an endothermic melting peak, which are determined via differential scanning calorimetry and which satisfy relationships of
30° C.≤T2−T1≤68° C. and
30° C.≤T3−T2≤78° C.,
where
T1 represents an onset point of said exothermic crystallization peak,
T2 represents an end point of said exothermic crystallization peak and an onset point of said endothermic melting peak, and
T3 represents an end point of said endothermic melting peak,
wherein said recycled material includes a polyethylene terephthalate bottle-recycled material, and has an intrinsic viscosity, which is determined according to ASTM D4603, ranging from 0.50 dL/g to 1.00 dL/g, and wherein said alcohol modifier is neopentyl glycol.